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A. 0. M. LUFGREN.

PORTABLE SAWING MECHANISM.

APPLICATION FILED DEC- 5, 1921.

Reissued Feb. 28, 1922.

A. 0. M. LfiFGREN. PORTABLE SAWING MECHANISM.-

APPLlCATlON FILED DEC. 5, 1921.

Reissued Feb. 28, 1922. 7 15,294.

2 SHEETSSHEET 2.

gnuento'a (for ucq following is a -The present invention relates to a tree uu 'rao' STATE-S PATENT 0mm.

mum o. I. rbrem, or s'rocxnom, SWEDEN, 'AssmNon '10 ARVID ems'ru MICHAEL WK, 0] DJ'UBSHOLH, SWEDEN, AND OSCAR .BOBERT GBDN- mm, 01' STOCKHOLI, SWEDEN.

ron'rannr. sawme uncnmsm' 01131111 No. 1,303,809, dated Kay 18, 1919, Serial No. 266,464, filed. December 5, 1918. Application 'for' reissue filed December 5, 1921. Serial No. 520,153.

To all whom it may aohcem:

Be it known that I, ALBERT OLOF Mnror ae LoroRnN, a subject of the King of Sweden, residing at Stockholm, Sweden, have invented certain new and useful Improvements in Portable Sawing Mechanism, of which the ecification.

felling apparatus; Several difierent constructions of tree felling apparatus already exist but of thesethere' is none, however, that has hitherto been applied in practice in any wide degree, owing to the fact that the saw used in the same is in the form of a chain, which, as is easily understood, is rather weak I and besides very expensive. Inconsequence of the lack of durability, great loss of time is frequently caused if necessary repairs are to be made or a new chain is to be inserted at the place where the work is carried on. In any case, a chain, in consequence of the great strain on the many weak links, is rather soon worn out, and then a new chain must be inserted.

The present invention has for its object to remedy the said disadvantages. This object is attained by a band-saw arranged in a frame which, as in some other constructions is made to stretch the band-saw and which is. provided with deviating rollers,-

over which the band-saw travels. In order, however, that a \frame provided with a band-saw. may be advantageous in use, it has been necessary to arrange the band-saw blade in another way than that in which the saw chains have been arranged as will be further described below.

A tree-felling apparatus-constructed in accordance with the present invention is shown in the accompanying drawings in which:

Figure l is a planand Figure 2 a side view of the same in the position which it assumes in felling a tree.

Fig. 3 is a section on the line 3-3 in igs. 4 and 5 show the driving device for the saw, in plan and side views.

Fig. 6 shows'a detail.

7 Specification of Reissued Letters Patent.

' Reissued Feb. 28,1922.

Fig. 7 shows a frame adapted to support the apparatus in sawing through the trunk of a'standing tree.

Figs. 8 and 9 show a device in the apparatus, viewed from the side and end, and intended to be used in cutting the trunk of a tree after it has been felled.

Fig. 10 shows a part of the saw-band.

In the form of apparatus shown in the drawings, the saw frame is triangular and formed of two rods 1 and '2, which preferably consist of light steel tubes, and each of wh1ch .at either end is provided with an extension constructed of plates, as a casing or cover for a .disk, serving as a deviating roller, over which the band-saw blade runs,

and the shaft of which is carried by the said plates. The shaft 3 of the roller 4, which is at the point of junction between the extensions of the rods 1 and 2, also serves as the pivot about which these rods may turn, so that their other ends, with the rollers 5 and 6, can be "moved toward or away from one another. the last-named rollers at the required distance from one another, there are on the plates which house the roller 4, projecting ears 7 and 8, of which the ears 7 serve as supports for one end of a bolt 9, the other threaded end of which enters into a nut arranged between the ears 8. By screwing the bolt 9 in one direction or the other, the'distance between the rollers 5 and'6 is increased or diminished. Over the rollers 4, 5- and 6 is laid an endless band-saw blade 10, the length of which is adjusted to the len h In order to adjust and keep 4 of the rods 1 and 2, and to the desired 'stance between the rollers 5 and 6; The saw- 'closed in the cover or casin "13, which is mounted on the casing of t e roller. In order to insure that the roller really may drive the blade without this latter being tightly stretched, the roller is on its onor the like, which enter into correspon ing apertures14 arranged in the blade or in recesses made in one or'both edges'of the same.

In order to set that part of the sawrblade, which is between the rollers 5 and: 6 and which is intended to carry out thesawing, in a suitable position in relation to the saw frame, so that the sawing can be conveniently executed, there extends from the casing for each of the rollers 5,6 a guide-arm 15, at the ends of which are arranged two guiderollers 16, (Fig. 6) between which the sawblade runs, and a supporting roller 17 mounted in the guide-arm engages the back edge of the saw-blade. The guide-rollers 16 are so placed that the portion of the blade between them and the place of contact of the blade with the adjacent roller 5 and 6 respectively is twisted about gof a turn,"so that the saw frame, when the side surfaces of the blade in the gap between the guide arms 15 is in a horizontal plane, assumes apfproxi mately the position indicated in Fig. 2. For it is evident that, if there should be no device for the twisting of. the saw blade, the saw frame would have to be set vertically, i. e.

. parallel to the tree .trunk to be cut, in order that a horizontal cut throughthe tree might be obtained, which, however, would be impossible, as the trunk would prevent the saw rame being fed forward.

In place of the rollers 16 17 there may be placed, if so desired, at the outer end of each of the two arms 15, a disk 33, Figs. 4 and 5,. which, for example, may be of socalled fiber, and which is simply .provided with a slit suitedto the saw blade and in.

such a position that the blade is'turned by the slit to the same position as by the rollers 16. i

, In order that. a saw-blade may be easily inserted in, and removed from the frame, the rods 1 and 2 are so placed in relation to the rollers 4L, 5 and 6, that the blade runs freely at the outer side of each of the two rods (see Fig. 3),while at that part of the circumfer ence of the rollers 4', 5 and 6,.where the sawblade is in contact with the same there is in the casing for each of therollers an opening or slot 18 (see Figs. 4 and 5) throng which the "blade can, on edge, be in serted in ortaken out from its place. Inthe guide arms 15 there are also corresponding openings or slits for the insertionand remova of "the blade. As a protection for the blade 10 running along the rods 1 and 2,

as well as for protecting the hands, when saw1ng,'or transporting the apparatus, the

rods are provided with channels '19, Figs. 1- 2 and3, placed along the rods. Each hannel 19 may be at one of its edges hinged to the rod, and at its other edge rovided with some fastening device (a sli ing bolt or the like), so ,that the chamber formed between the channel and the rod can be opened and closed for the insertion and removal of saw-blades. v r In exchanging saw-blades it frequently occurs that theblade which is inserted in laceof the previous blade is of another ength' than the old one, in which casethe distance between the rollers 5 and 6 must be adjusted, and this is effected with the aid of the bolt 9, but whenalteringthe distance, the direction of the guide arms 15 obviously also must be adjusted. This is efl'ected by forming the two ide arms inte ral with casings which partially surround t e rollers 5 and 6, and these casings, to ether with the arms are rotatable around t e shafts of the rollers. In order that each of the two arms 15,, afterit has been adjusted in the required direction, may be retained in that position, there is a locking device, which may consist of, for instance, a screw 20, the

nut of which is mounted in one part of the casing and for which there ice. circular slit 21 in the otherpart of. the casing. 4 In felling a tree it is necessaryto keep the ends of the" ide arms 15, opposing one,

another, at a when the saw passes through the'latter, these arms do not come into contact with the tree. For attaining this purpose, that arm, which the saw, in sawing strives to draw toward the tree, is provide with a pin 22, for. which there is a guide, consisting qfa frame 23 (Figs. 2 and 7) placed on the ground close to the tree, which may suitably consist of a bent U-iron, or an le iron, or the like, and which may be furnished withspikes 24 to be driven into the trunk, so that the frame lies steady. The frame is preferably provided with two arms-25, 26, so that asupportis I obtained for eachv of the guide arms 15, and

.the arm 25, forms during the sawin the Y gulde along which the pin 22 runs an thus stance from the tree,-so that prevents the arm 15 from being drawn to ward the tree,

' In order to enable the apparatus to be used also for the cutting of felled trunks, thereis a device, consisting of aholder 27, adapted to be placed on that arm'15, which is pro-' videdwith' the -in 22 and this'holder carries an angle (lgigs. 8 and 9) which is rotatable on a pivot 28 projecting from the holder. At the beginning of the sawing,

the angile'assumes' the position indicated in- Fig. 8 y full lines, the arm 29 of the angle then resting against the side of the trunk, receives support against a pin 30 mounted on the holder,-so that the guide arm 15 cannot be drawn toward the trunk. risthe saw penetrates into the trlmk,:the 0th arm'31 of the angle approaches the-'s'ain where- Ill ' I claim as new and desire to secure by Let if the trunk has not-yet been sawed through,

the arm 29 moves out of contact with the trunk and only the arm 31rests against it. Having now described my invention, what ters Patent is: a

1. A portable sawing mechanism comprising a pair of rods, roller housings on the 7, ends of said rods, a pivot connecting a housing at one end of one'rod to the housing at one end of the other rod, a roller mounteding a pair of rods, roller housings on the on said pivot, rollers mounted in the housings at the opposite ends of said rods, a flexible saw running over said rollers, and longitudinal housings pivoted on said rods, the saw running along said rods and through said housings.

2. A portable sawing mechanism comprising a pair of rods, roller housings on the ends of said rods, a pivot connecting a housing at one end of one rod to thehousing at one end of the other rod, a roller mounted on said pivot, rollers mounted in the housings at the opposite ends of said rods, a flexible saw running over said rollers, and

tubular extensions pivotally connected to the last mentioned housings for enclosing the ends of the run of the saw otherwise exposed.

3. A portable sawing mechanism comprisends of said rods, a pivot connecting a housing at one end of one rod to the housing at one end of the other rod, a roller mounted on said pivot, rollers mounted in the housings at the opposite ends of said rods, a flexible saw running over said rollers, tubular extensions pivotally connected to the last mentioned housings for enclosing the endsof the run of the saw otherwise exposed,

and means for locking said tubular exten- V sions in a. determined position.

'4. A portable sawing mechanism comprising a pair of rods, roller housings on the ends of said rods, a pivot connecting a housing at one end of one rod to the housing at one end of the other rod, a roller mounted on said pivot, rollers mounted inthe housings at the opposite ends of said rods, a

flexible saw running over said rollers, tubular extensions pivotally connected to the last mentioned housings 'of the rods for enclosing the run of. the saw otherwise exposed, and means located in the tubular extensions for changing the plane of the run of the saw.

5. A portable sawing device comprising a frame and a saw traveling on said frame,

means carried on said frame to engage the work and resist the tendency of the saw travel to move the frame bodily, said means" comprising an angle bar pivoted to the frame, so arranged that one arm engages the work and as the saw enters the work the bar may oscillateon its pivot to engage the other arm thereof.

6. A portable sawing mechanism of the kind defined by claim -2 having means for changing the plane, of the exposed run of the saw, whereby said rods may be supported in an inclined position relatively to the vertical while the exposed run of the saw is traveling in a horizontal plane.

7. A portable sawingmechanism of the 'kind defined by claim 2 in which the housextensions are provided with slots to permit the detachment of the saw from said housings and extensions. i

10. A portable tree-felling machine including a substantially triangular manually supportable frame having a plurality of rods pivotally connected together, housings. on said rods. a roller carried by the frame and mounted on the pivot connecting the rods, other rollers carried by said rods, a flexible saw movable over said rollers, said frame having a gap across which the exposed run of the saw extends, and means carried by the frame for changing the plane of the exposed run of the saw, whereby said frame may be held in an inclined position relatively to the vertical while the exposed run of the saw is traveling in a horizontal plane. I

11. A portable sawing machine comprising a frame, rollers carried in the frame, .pivots in the frame for the rollers, a flexible 115 endless band saw paming over the rollers and propelled by one of the rollers, means wherebyrthe saw may be kept taut as it is propelled, means for twistingjthe'blade to change substantially but less than ninety de- 12. A' machine of the kind defined by claim 11 in which said housings cover the entire saw with the exception of that portion which is actually doing the cutting.

13. machine of thekind defined bychannel-shag. ed members pivotally con-3 cialimjllfin'vzlhich tgedilramhe include's'a 1:11- pected to sm rods. 4 r ity 0 r0 s an t e .jouszin fincu e chinnel members connectedto sai rods. V E i 14. A machine of the kind defined by Witnesses: H

claim 11 in which the frame includes a, lu- CARL TH. SUNDHOLM,

rality of rods, and the housings inc ude R. TGTTERMAN. 

